Perinatal mortality in gestational hypertensive versus non-hypertensive twin pregnancies, U.S. matched multiple birth data 1995–2000.

Abstract

<p>HR = Hazard ratio; CI =  confidence interval.</p><p>*Hazard ratios adjusted for maternal race, marital status, age, education, parity, smoking, other maternal major illnesses, fetal sex, mode of delivery and twin-cluster level dependence in Cox regression models.</p><p>**There were a significant number of perinatal deaths with missing birth weights.</p>t<p> Gestational age group-specific mortality rates and hazard ratios were calculated using the number of foetuses at risk and the number of perinatal deaths in the time interval specified.</p

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